/* | |

* Copyright (c) 2013, Kenneth MacKay | |

* All rights reserved. | |

* | |

* Redistribution and use in source and binary forms, with or without | |

* modification, are permitted provided that the following conditions are | |

* met: | |

* * Redistributions of source code must retain the above copyright | |

* notice, this list of conditions and the following disclaimer. | |

* * Redistributions in binary form must reproduce the above copyright | |

* notice, this list of conditions and the following disclaimer in the | |

* documentation and/or other materials provided with the distribution. | |

* | |

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |

* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |

* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |

* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |

* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |

* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |

* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |

* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |

* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |

*/ | |

#include <stdbool.h> | |

#include <stdint.h> | |

/* Create a public key from a private key. | |

* | |

* Inputs: | |

* private_key - Your private key. | |

* | |

* Outputs: | |

* public_key - Will be filled in with the public key. | |

* | |

* Returns true if the public key was generated successfully, false | |

* if an error occurred. The keys are with the LSB first. | |

*/ | |

bool ecc_make_public_key(const uint8_t private_key[32], uint8_t public_key[64]); | |

/* Create a public/private key pair. | |

* | |

* Outputs: | |

* public_key - Will be filled in with the public key. | |

* private_key - Will be filled in with the private key. | |

* | |

* Returns true if the key pair was generated successfully, false | |

* if an error occurred. The keys are with the LSB first. | |

*/ | |

bool ecc_make_key(uint8_t public_key[64], uint8_t private_key[32]); | |

/* Check to see if a public key is valid. | |

* | |

* Inputs: | |

* public_key - The public key to check. | |

* | |

* Returns true if the public key is valid, false if it is invalid. | |

*/ | |

bool ecc_valid_public_key(const uint8_t public_key[64]); | |

/* Compute a shared secret given your secret key and someone else's | |

* public key. | |

* Note: It is recommended that you hash the result of ecdh_shared_secret | |

* before using it for symmetric encryption or HMAC. | |

* | |

* Inputs: | |

* public_key - The public key of the remote party. | |

* private_key - Your private key. | |

* | |

* Outputs: | |

* secret - Will be filled in with the shared secret value. | |

* | |

* Returns true if the shared secret was generated successfully, false | |

* if an error occurred. Both input and output parameters are with the | |

* LSB first. | |

*/ | |

bool ecdh_shared_secret(const uint8_t public_key[64], | |

const uint8_t private_key[32], | |

uint8_t secret[32]); |